They have all the usual emotions regarding other vampires, even if the balance is different. Besides, moral considerations can move you where emotions disagree, and it's "should" we are talking about, not "is". What should you do, not what you'll actually do. What should you feel, not what you'll actually feel. For example, non-vegetarian vampires very likely shouldn't kill people for food.

Exactly. And as well as having different emotional responses to murder the line between self defense and murder is altered beyond recognition too. The interpersonal boundaries we have are adapted for human capabilities and to a significant extent by the power structures of our particular culture. Interpersonal boundaries in a culture where people can drastically mess with your mind based on proximity would be quite different.